void main() {
  //var变量
  var name = 'jack';
  var age = 18;
  print(name + age.toString());
  //const 初始化赋值
  const info = 998;
  //info = 66;//报错,无法修改
  //const num = age + info;//报错
  print(info);
  print(num);

  //final 运行时间赋值
  final food = '杨柳下望影';
  print(food);
  final noodles = age + info;
  print(noodles);
  //建议：变量var，常量先用const，报错了在改final
}
